README_iScience: SF-20 Dataset and Analysis Code

1. Overview
This repository contains the de-identified dataset and analysis code used for the study of the 20-item Short Form Health Survey (SF-20). 
All files pertain to the analyses described in the accompanying manuscript.

Dataset file: sf20.sas7bdat
Analysis code: iscience_code.sas

2. File Descriptions
sf20.sas7bdat: SAS data file containing de-identified data, including participant IDs, visits, SF-20 items, and summary scores.
iscience_code.sas: SAS code, as described in the manuscript.

3. Variables in sf20.sas7bdat
Variable	Description
enc_id		Encrypted, de-identified ID
visit		survey visit (1 = baseline, 7 = day 30, 8 = day 60)
P1–P6		SF-20 Physical Functioning items (1–6)
M1–M5		SF-20 Mental Health items (1–5)
G1–G5		SF-20 General Health items (1–5)
Pn1		SF-20 Pain item
R1–R2		SF-20 Role Functioning items (1–2)
P_all		Physical Functioning summary score (derived from P1–P6)
M_all		Mental Health summary score (derived from M1–M5)
G_all		General Health summary score (derived from G1–G5)
R_all		Role Functioning summary score (derived from R1–R2)
S_all		Social Function summary score (from S1)
pn_all		Bodily Pain summary score (from Pn1)
Note: SF-20 items are computed as described in the SF-20 user manual, and may reflect domain scores or summary scores, as detailed in the analysis code.

4. Data Use Notes
All data are de-identified and comply with institutional and journal data sharing guidelines.
If you use these data or code, please cite the related publication.

5. Contact
For questions regarding the dataset or code, please contact:
Mi-Sun S. Lee
Email: mslee@hsph.harvard.edu
